My square root was 44. The two closest roots to it are 36 and 49. 36=6 and 49=7 so 44 is closer to 49 so it will be above 6.4. I know its not 6.5 or 6.9. so it has to be 6.6, 6.7, or 6.8. so i think the answer is 6.7.